Thermal performance assessment test correction calculation method for steam turbine with low-temperature economizer

Abstract

The invention discloses a thermal performance assessment test correction calculation method for a steam turbine with a low-temperature economizer. The thermal performance assessment test correction calculation method comprises the steps: a, conducting a steam turbine performance assessment test according to ASME PTC6-2004 Steam Turbine Performance Test Regulations; b, calculating the heat consumption rate HRt of the steam turbine in an actual measurement state; c, in the first kind of correction calculation of the turbine performance test, providing seven low-temperature economizer related parameter correction calculation methods for negotiation and selection of a turbine buyer and a turbine seller; and d, ending the iterative convergence of the first type of correction calculation, completing the correction calculation of the conventional parameters and the related parameters of the low-temperature economizer, and carrying out second-class parameter correction calculation to finally obtain the heat consumption rate and the output power of the steam turbine with the low-temperature economizer corrected to the design boundary. According to the thermal performance assessment test correction calculation method, the operation boundary condition of the low-temperature economizer is corrected to a design value in the performance test of the steam turbine with the low-temperature economizer, so that the divergence or dispute of the buyer and the seller to the performance acceptance test result of the steam turbine is avoided.

Description

technical field [0001] The invention belongs to the field of thermal performance tests of generator sets, and in particular relates to a correction calculation method for thermal performance assessment tests of designed steam turbines with low-temperature economizers. Background technique [0002] Coal-fired power plant boiler exhaust heat loss is the largest proportion of boiler heat loss, accounting for about 60% to 70% of the total loss of the boiler, accounting for 5% to 8% of the total input heat of the boiler. Adding low-temperature economizer for waste heat utilization in the tail flue of the boiler is a widely used method to reduce the exhaust gas temperature and improve the energy efficiency of the unit. After adding the low-temperature economizer, the energy efficiency changes of the unit are mainly reflected in the following aspects: (1) The condensed water absorbs part of the exhaust heat of the boiler, which reduces the amount of steam extracted from the steam e...

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Problems solved by technology

However, due to the addition of the low-temperature economizer, it is an external heat source for the steam turbine, and its operating characteristics are highly volatile due to factors such as changes in boiler coal quality, load fluctuations, and operation control. The inlet water temperature, inlet water flow rate, heat absorption, etc. cannot be exactly the same as the design conditions

If these boundary conditions are not considered to be corrected in the calculation of the heat rate assessment test of the design of the steam turbine including the low-temperature economizer, the calculated heat rate of the steam turbine can only represent the performance of the steam turbine under the operating state of the low-temperature economizer, while No direct comparison with steam turbine heat rate at low temperature economizer design conditions

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